US patent history reviewed at a touring model exhibition

        

      

      

        
          By Lin Qi | 
          chinadaily.com.cn |
          Updated: 2018-05-15 10:38
          
          
          
          
        


        
      

      

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  The Spirit of Invention brings models designed and made by 19th-century inventors who attempted to bring changes to every aspect of life, from a sewing machine, a wool scissoring machine, a printer to an engine. [Photo by Xiao Fei/China Daily] 
 
 

 

        


        
        
      

        
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